Vacheron Constantin Overseas perpetual calendar ultra-thin skeleton

Vacheron Constantin's Overseas perpetual calendar ultra-thin skeleton, reference 4300V/220R-B642, measures 41.5 mm across in rose gold. The case stands 8.1 mm thick and pairs with a rose gold bracelet closed by a folding clasp in the same metal. A sapphire crystal covers the skeletonised dial, and a sapphire caseback shows off the self-winding calibre 1120/3 QPSQN/1, running with 40 hours of power reserve and carrying the Geneva Seal. The perpetual calendar tracks day, date, month and leap year in a four-year cycle, and a moon phase display sits among the openworked bridges. Hands and indices carry luminous treatment for legibility. Rated to 50 metres, the case still allows a swim without hesitation.